a) $$14 - \frac{6}{9} = 13 + 1 - \frac{6}{9} = 13 + \frac{9}{9} - \frac{6}{9} = 13 + \frac{3}{9} = 13\frac{3}{9} = 13\frac{1}{3}$$
б) $$82 - \frac{7}{15} = 81 + 1 - \frac{7}{15} = 81 + \frac{15}{15} - \frac{7}{15} = 81 + \frac{8}{15} = 81\frac{8}{15}$$